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Print head for printing a suspension fluid comprising particles, printing apparatus and method

a printing head and suspension fluid technology, applied in food shaping, food science, food coating and other directions, can solve the problems of clogging of the nozzle, affecting the printing effect, and affecting the printing effect, and achieve the effect of stable droplet flow and printing

Inactive Publication Date: 2018-12-25
NEDERLANDSE ORG VOOR TOEGEPAST NATUURWETENSCHAPPELIJK ONDERZOEK TNO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively prevents nozzle clogging by applying sufficient shear forces to break up agglomerations, ensuring reliable and stable droplet formation and flow, even with highly filled suspensions, without the need for filtration or nozzle enlargement.

Problems solved by technology

As a result of the bridge formation, the nozzle will become clogged.
This problem is likely to occur with suspension fluids comprising large particles, and may therefore expectedly be diminished by making the outlet opening of the nozzle larger.
However, this would likewise increase the flow through the nozzle outlet, resulting in larger droplets (which is in many cases not desired).
Moreover, enlarging the nozzle outlet is also not sufficiently effective to resolve the problem.
It has been found that suspension fluids with small particles may likewise clog the nozzle, and bridge formation alone does not explain this.
Therefore, even with small particles, clogging may occur.

Method used

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  • Print head for printing a suspension fluid comprising particles, printing apparatus and method
  • Print head for printing a suspension fluid comprising particles, printing apparatus and method
  • Print head for printing a suspension fluid comprising particles, printing apparatus and method

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Embodiment Construction

[0035]A schematic illustration of the principles of a printing system or printing apparatus in accordance with the present invention is provided in FIG. 1. The printing apparatus 1 comprises a suspension fluid container 2. The suspension fluid container 2 comprises a suspension fluid which is to be printed using a print head 4 in accordance with the present invention. The suspension fluid may for example comprise a liquid including a suspension of particles. For example, the suspension fluid may be water including a suspension of a food ingredient in the form of particles. Instead of water, a different liquid having a different viscosity and different properties may be applied. For example, the liquid could be an oil having a suspension of the food ingredient. Instead of a food ingredient, the printing apparatus of the present invention may also be used for printing other suspensions, such as a liquid comprising a pharmaceutical component (e.g. a medicine in the form of a powder) or...

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Abstract

The invention is directed at a print head for printing a suspension fluid. The print head comprises a nozzle having one or more nozzle outlets for allowing the suspension fluid to be ejected from the nozzle, a flow path including a supply channel for supplying the suspension fluid to the one or more nozzle outlets, and a supply pump for establishing a flow within the flow path. The nozzle further comprises an actuator for imparting pressure fluctuations on the suspension fluid at the one or more nozzle outlets for generating a stream of droplets therefrom. The flow path further comprises a shear section for locally increasing the shear rate at least at a location in the flow path upstream of the one or more nozzle outlets. The flow path further includes a return channel for allowing excess fluid not ejected from the nozzle to flow away from the one or more nozzle outlets. The shear section is configured to locally increase the shear rate to be larger than a shear rate obtained near at least one of the one or more nozzle outlets. The invention is further directed at a printing apparatus, a method of printing, and a method of manufacturing a print head.

Description

[0001]This application is the U.S. National Phase of, and Applicants claim priority from, International Patent Application Number PCT / NL2015 / 050753 filed 29 Oct. 2015, which claims priority from EP 14190858.2 filed 29 Oct. 2014, each of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention is directed at a print head for printing a suspension fluid, the print head comprising a nozzle having one or more nozzle outlets for allowing the suspension fluid to be ejected from the nozzle, a flow path including a supply channel for supplying the suspension fluid to the one or more nozzle outlets, and a supply pump for establishing a flow within the flow path. The invention is further directed at a printing apparatus comprising such a print head, to a method of printing suspension fluids, and to a method of manufacturing a print head.BACKGROUND[0003]A recent development in the field of three dimensional printing technology is the application 3D printing t...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B41J2/14B29C64/112A23P30/20A23P20/25
CPCB41J2/14B29C64/112A23V2002/00A23P2020/253A23P30/20B41J2202/11B41J2202/12
Inventor RIJFERS, ANDRIESHOUBEN, RENE JOSKOLDEWEIJ, ROBIN BERNARDUS JOHANNES
Owner NEDERLANDSE ORG VOOR TOEGEPAST NATUURWETENSCHAPPELIJK ONDERZOEK TNO
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